<template>
  <!-- 商品详情页 -->
  <view v-if="goods_info.goods_name">
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
      <swiper-item v-for="(item, i) in goods_info.pics" :key="i">
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>
    <!-- 商品信息区域 -->
    <view class="goods-info-box">
      <view class="price">￥{{ goods_info.goods_price }}</view>
      <view class="goods-info-body">
        <view class="goods-name">{{ goods_info.goods_name}}</view>
        <view class="favi">
          <uni-icons type="contact" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <view class="yf">快递：免运费</view>
    </view>
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>
    <view class="goods-nav">
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup"
      @click="onClick" @buttonClick="buttonClick"></uni-goods-nav>
    </view>
  </view>
</template>

<script>
  //导入vuex的mapState跟mapMutations方法
  import { mapState, mapMutations, mapGetters } from 'vuex'
  import badgeMin from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMin],
    computed: {
      //对全局变量loginStatus进行监控
      ...mapState('m_cart',[]),
      //把total模块中名称为total的getter 映射到当前页面中使用
      ...mapGetters('m_cart', ['total'])
    },
    watch: {
      // 定义 total 侦听器，指向一个配置对象
     total: {
       // 1. 监听 total 值的变化，通过第一个形参得到变化后的新值
       // handler 属性用来定义侦听器的 function 处理函数
       handler(newVal) {
         // 2. 通过数组的 find() 方法，找到购物车按钮的配置对象
         const findResult = this.options.find(x => x.text === '购物车')
         if (findResult) {
           // 3. 动态为购物车按钮的 info 属性赋值
           findResult.info = newVal
         }
       },
       // immediate 属性用来声明此侦听器，是否在页面初次加载完毕后立即调用
       immediate: true
     }
    },
    data() {
      return {
        // 商品详情对象
        goods_info: {},
        //左侧按钮组的配置对象
        options: [{
        	icon: 'headphones',
        	text: '客服'
        }, {
        	icon: 'shop',
        	text: '店铺',
        	infoBackgroundColor:'#007aff',       			
        }, {
        	icon: 'cart',
        	text: '购物车',
        	info: 0
        }],
        //右侧按钮组的配置对象
        buttonGroup: [{
            text: '加入购物车',
            backgroundColor: '#ff0000',
            color: '#fff'
          },
          {
            text: '立即购买',
            backgroundColor: '#ffa200',
            color: '#fff'
          }
        ]
      };
    },
    onLoad(options) {
      const goods_id = options.goods_id
      this.getGoodsDetail(goods_id)
    },
    methods: {
      // 定义请求商品详情数据的方法
      ...mapMutations('m_cart', ['addToCart']),
      async getGoodsDetail(goods_id) {
        const { data: res } = await uni.$http.get('/api/public/v1/goods/detail', {goods_id})
        if (res.meta.status !== 200) return uni.$showMsg()
        // 使用字符串的 replace() 方法，为 img 标签添加行内的 style 样式，从而解决图片底部空白间隙的问题
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img/g, '<img style="display:block;" ').replace(/webp/g, 'jpg')
        this.goods_info = res.message
      },
      preview(i) {
        //预览图片放大 previewImage
        uni.previewImage({
          //预览时 默认显示图片的索引
          current: i,
          //所有图片url地址数组
          urls: this.goods_info.pics.map(x => x.pics_big)
        })
      },
      //跳转至购物车
      onClick(e) {
        if (e.content.text === '购物车') {
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },
      buttonClick(e) {
       if (e.content.text === '加入购物车') {
         // 每个商品的信息对象，都包含如下 6 个属性：
         // { goods_id, goods_name, goods_price, goods_count,goods_small_logo, goods_state }
         const goods = {
           goods_id: this.goods_info.goods_id, // 商品的Id
           goods_name: this.goods_info.goods_name, // 商品的名称
           goods_price: this.goods_info.goods_price, // 商品的价格
           goods_count: 1, // 商品的数量
           goods_small_logo: this.goods_info.goods_small_logo, // 商品的图片
           goods_state: true, // 商品的勾选状态
         }
         //调用addToCart方法
         this.addToCart(goods)
       } 
      },
    }
  }
</script>

<style lang="scss">
swiper {
  height: 750rpx;
  image {
    width: 100%;
    height: 100%;
  }
}
.goods-info-box {
  padding: 10px;
  padding-right: 0;
  .price {
    color: #c00000;
    padding-right: 0;
    margin: 10px 0;
  }
  .goods-info-body {
    display: flex;
    justify-content: space-between;
    .goods-name {
      font-size: 13px;
      padding-right: 10px;
    }
    .favi {
      width: 120px;
      font-size: 12px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      border-left: 1px solid #efefef;
      color: gray;
    }
  }
  .yf {
    font-size: 12px;
    color: gray;
    margin: 10px 0;
  }
}
.goods-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
}
</style>
